Smoke detector



FIG. 1 is a top plan view of a smoke detector showing my new design;

FIG. 2 is a side elevational view of the smoke detector;

FIG. 3 is a bottom view of the smoke detector;

FIG. 4 is a top plan view of a second embodiment of the smoke detector;

FIG. 5 is a side elevational view of the second embodiment of the smoke detector; and

FIG. 6 is a bottom view of the second embodiment of the smoke detector. 

The ornamental design for a smoke detector, as shown and described. 